alt art pokemon card - Chi-Yu 259/193 - Paldea Evolved - Special Illustration Rare Pokémon Hit Points80 HP Form What Are Alt Art Pokémon

If the deck can handle playing a colourless land with no upside to get potential benefits while on the draw, then Gemstone Caverns can be maindeckable

Grma, Saruman's Footman In the Darkness Bind Them Lidless Gaze Lord of the Nazgl Merry, Warden of Isengard Mirkwood Trapper Moria Scavenger Oath of Eorl Pippin, Warden of Isengard Radagast, Wizard of Wilds Riders of Rohan Sail into the West Song of Erendil Summons of Saruman Taunt from the Rampart Too Greedily, Too Deep

When you drop it, it alllows you to move energy around however you like, which can be very effective

I might get it late if a big load of tokens or an exile removal spell didn't sort out my situation but a card in my deck did